To measure windows for replacement, first ... If a window is not plumb or level, you may need to make adjustments to the opening, such as inserting wedge-shaped pieces of material called shims ...

Vinyl windows make up the largest segment of the replacement window market ... the airflow velocity to 25 mph and then 50 mph and measure air leakage with a flow meter. They run this test at ...

Our research points to Castle, Champion, and Milgard at the top of the list for best window replacement ... The brands that made our top-five list all scored at least four out of five stars ...